Fix a bug in plugin self-management
Fix a bug in plugin self-management

For whatever reason, the `eval` doesn't like things being defined with
strings as double-quoted entities; it likely reads them as comments (I
assume this means `eval` isn't strictly a re-invocation of the standard
parser). At any rate, this fixes the bug by making the line being
evaluated use single quotes instead of double quotes. Easy-peasy.

sycobuny/rcfiles,sycobuny/rcfiles